semi implemented and features implemented save checkpoint

docs/features/unchecked/scanner/version-comparison-explainability-ux.md

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+# Version Comparison Explainability UX ("Why Fixed/Vulnerable" Popover)
+
+## Module
+Scanner
+
+## Status
+IMPLEMENTED
+
+## Description
+UI explainability for distro version comparisons: "Compared With" badge showing which comparator (RPM EVR, dpkg, APK, SemVer) was used, and "Why Fixed/Vulnerable" popover showing step-by-step comparison proof lines (epoch, upstream, revision). Version comparators emit human-readable proof lines showing each comparison step.
+
+## Implementation Details
+- **Version Comparison Evidence**:
+  - `src/Scanner/__Libraries/StellaOps.Scanner.Evidence/Models/VersionComparisonEvidence.cs` - `VersionComparisonEvidence` model capturing step-by-step comparison proof lines (epoch, upstream, revision) with the comparator type used
+- **Service Version Comparer**:
+  - `src/Scanner/__Libraries/StellaOps.Scanner.ServiceSecurity/Analyzers/ServiceVersionComparer.cs` - `ServiceVersionComparer` comparing service versions with proof line emission
+
+## E2E Test Plan
+- [ ] Compare an RPM package version and verify the "Compared With" badge shows "RPM EVR" as the comparator
+- [ ] Verify the "Why Fixed" popover shows step-by-step comparison proof: epoch comparison, upstream version comparison, and release/revision comparison
+- [ ] Compare a dpkg package version and verify epoch, upstream-version, and debian-revision are shown separately in proof lines
+- [ ] Compare an APK package version and verify the Alpine-specific version comparison rules are applied and explained
+- [ ] Verify SemVer comparisons show major.minor.patch breakdown with clear fixed/vulnerable reasoning
+- [ ] Verify proof lines are human-readable and explain why the installed version is fixed or vulnerable relative to the advisory range